Run-length Limited
Run length limited or RLL coding is a line coding technique that is used to send arbitrary data over a communications channel with bandwidth limits. This is used in both telecommunication and storage systems which move a medium past a fixed recording head. Specifically, RLL bounds the length of stretches (runs) of repeated bits during which the signal does not change. If the runs are too long, clock recovery is difficult — if they are too short, the high frequencies might be attenuated by the communications channel. By modulating the data, RLL reduces the timing uncertainty in decoding the stored data, which would lead to the possible errant insertion or removal of bits when reading the data back. Run-length limited codes were widely used in hard disk drives until the mid-1980s, and are still used in digital optical discs such as CD, DVD, MD, Hi-MD and Blu-ray. This mechanism ensures that the boundaries between bits can always be accurately found (preventing bit slip), while efficiently using the media to reliably store the maximum amount of data in a given space. Early disk drives used very simple encoding schemes, such as RLL (0,1) FM code, but higher density RLL (2,7) and RLL (1,7) codes became the de facto industry standard for hard disks by the early 1990s.
Read more about Run-length Limited: Need For RLL Coding, History, Technical Overview, Coding
Famous quotes containing the word limited:
“Psychology has nothing to say about what women are really like, what they need and what they want, essentially because psychology does not know.... this failure is not limited to women; rather, the kind of psychology that has addressed itself to how people act and who they are has failed to understand in the first place why people act the way they do, and certainly failed to understand what might make them act differently.”
—Naomi Weisstein, U.S. psychologist, feminist, and author. Psychology Constructs the Female (1969)